I recently bought a 77 cat model 2000s its a 250. The problem is it will run for about an hour then stops :devil: Have already replaced the coil.condenser and points. After it stops there is no spark and after a couple of days it will run again for the same amount of time. Can anyone help me please.

Replace your CDI box. I had the same problem with my '77 Jag 340. They are a little pricey. Get an after market. Arctic Cat's are around $300. Royal Distributing should be able to help you.